Method of producing copper-zinc compositions and alloy for the production thereof.



. sitions and Alloys for the UNITED STATLET OFFICE WALTER ROBEL, OFVIENNA AUSTRIA-HUNGARY.

METHOD .OF PRODUCING COPPER-ZINC COMPOSITIONS AND ALLOY FORTHE PRODUC-TION THEREOF.

No Drawing.

' Specification of Letters Patent.

Application filed July 9, 1909. Serial No. 506,783.

To all whom it may concern:

die it known that I, WALTER RtinEL, a citizen of the Empir of Germany,residing at- Vienna, in the Empire'of Austria-Hun gary, have invented anew and useful Method of Producing Co per-Zinc Comporoduction Thereof.of which the following is a specification.

Heretofore copper-zinc compositions have been produced by melting withcopper and zinc a small quantity of alloy consisting of copper. iron,nickel and aluminum. The composition. so produced possesses valuableproperties, but it is not snitable for many pnrwses because of its lowdensity, which rem crs it permeable to water under very high pressure.Such brass can be satisfactorily cast in bars, but itis not practicableto produce satisfactory castings for delicate working pieces and bodies,such as are required in valves and the like.

This invention relates to an improvement in the method of producingcopper-zinc compositions and in the alloy used for the purpose by whichthese defects are overcome.

In carrying out my. invention I employ an alloy which contains, inaddition to the copper, iron and aluminum, a quantity of manganese,either with orwithout nickel. The manganese increases the tensilestrength and the elastic limit. When nickel is used, it is in aconsiderably increascdpercentage and raises the limit of elasticity. Incase where a greater tensile strength and a higher limit of elasticityare required, both manganese and an increased percentage of nickel areemployed. If higher tensile strength and high elastic limit arerequired, the

. nickel may be omitted and the percentage of manganese may beincreased. When nickel is employed the alloy consists of 2 atomicweights of copper, 2 atomic weights of iron, 3 atomic weights of nickel,1 atomic weight of manganese and 1 atomic weight of aluminum. These maybe melted together in any known way. When nickel is omitted thepercentage of manganese 1s mcreased to 3 atomic weights. The two alloysW111 thus correspond to the following formulae:

(1 Gu Fe Ni MnAl; (2 cu F-e Mn Al.

Thcmanganosc may be added to the composition in the form offerromanganese, but

added to the copper and zinc: For example,

rammed Mar. 22, 1910.

a composition. according to my invention,

may consist of: 10 arts by weight of-thc alloy, 50 parts by weight ofcopper, 40 parts by weight of zinc, all being alloyed together n theusual known way.-

The relative proportions of the copper and zinc forming the compositionbody'to which the alloy is added may be varied.

The composition produced by this method possesses a tensile strength upto 60 kilograms per square millimeter. I

What I claim is: p

1. The method of producing copper-zinc compositions of increased tensilestrength and elastic limit which consists in adding to a mixture ofcopper and zinc, an alloy containing co per, iron, manganese andaluminum in su sta'ntially the proportions ecified to an amount up toten per cent. d? the whole mix.

2.-The method of producing copper-zinc compositions of increased tensilestrength and elastic limit which consists in adding to a mixture ofcopper and zinc, an alloy consistin of copper, iron, manganese, nickeland uminum in substantially the propertions specified to an amount up toten per cent. 0 the total mix.

3.-The alloy for increasing the tensile strength and elastic limit ofcopper-zinc compositions which contains two atomic weight of copper, twoatomic weights of iron, three atomic weights of manganese and one partof aluminum. 0

4. The alloyfor increasing the tensile strength and elastic limit ofcopper-zinc compositions which consists of two atomic weights ofcop er,two atomic weights of iron, three atom1c weights of nickel, and oneatomic weight each of manganese and aluminum.

I WALTER RllBEL.

Witnesses:

Ronnn'r W. HEINGARTNER, AUGUST Foconn.

